/*
 * Copyright (c) 1998, 2004, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
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 *
 *
 *
 *
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 */
package javax.swing.text.html;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.text.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import java.util.*;

/**
 * EditableView sets the view it contains to be visible only when the
 * JTextComponent the view is contained in is editable. The min/pref/max
 * size is 0 when not visible.
 *
 * @author Scott Violet
 */
class EditableView extends ComponentView {

  EditableView(Element e) {
    super(e);
  }

  public float getMinimumSpan(int axis) {
    if (isVisible) {
      return super.getMinimumSpan(axis);
    }
    return 0;
  }

  public float getPreferredSpan(int axis) {
    if (isVisible) {
      return super.getPreferredSpan(axis);
    }
    return 0;
  }

  public float getMaximumSpan(int axis) {
    if (isVisible) {
      return super.getMaximumSpan(axis);
    }
    return 0;
  }

  public void paint(Graphics g, Shape allocation) {
    Component c = getComponent();
    Container host = getContainer();

    if (host instanceof JTextComponent &&
        isVisible != ((JTextComponent) host).isEditable()) {
      isVisible = ((JTextComponent) host).isEditable();
      preferenceChanged(null, true, true);
      host.repaint();
    }
        /*
         * Note: we cannot tweak the visible state of the
         * component in createComponent() even though it
         * gets called after the setParent() call where
         * the value of the boolean is set.  This
         * because, the setComponentParent() in the
         * superclass, always does a setVisible(false)
         * after calling createComponent().   We therefore
         * use this flag in the paint() method to
         * setVisible() to true if required.
         */
    if (isVisible) {
      super.paint(g, allocation);
    } else {
      setSize(0, 0);
    }
    if (c != null) {
      c.setFocusable(isVisible);
    }
  }

  public void setParent(View parent) {
    if (parent != null) {
      Container host = parent.getContainer();
      if (host != null) {
        if (host instanceof JTextComponent) {
          isVisible = ((JTextComponent) host).isEditable();
        } else {
          isVisible = false;
        }
      }
    }
    super.setParent(parent);
  }

  /**
   * @return true if the Component is visible.
   */
  public boolean isVisible() {
    return isVisible;
  }

  /**
   * Set to true if the component is visible. This is based off the
   * editability of the container.
   */
  private boolean isVisible;
} // End of EditableView
